Rod Stewart and wife penny Lancaster Sporting matching Ray-Bans as they arrive at Ciprianis, London, England - 11.06.08

In photos published in Britain's News of the World newspaper on Sunday (22Jun08), Lancaster can be seen pulling down the low neckline of her form-fitting pink dress to reveal her bare breast to her excited husband.

The 63-year-old Maggie May hitmaker, who was dressed in a matching pink outfit, is then shown bending forward towards Lancaster's breast, taking her nipple in his mouth.

And the brazen couple's encounter took place on the open deck of their boat - in full view of other shocked holidaymakers.

Source: WENN